FSP is one of the largest manufacturers for OEM power supplies and adapters. Now they're launching a new fanless series, the "Aurum Xilenser", for users that want absolute silence. We have the AU-500FL on our test bench today. Like the previous Aurum offerings, the new generation is 80 Plus Gold certified. As for the fanless part, you'll want to be careful if you try for a complete silent (i.e. fanless) PC—it's one thing to have a fanless PSU when there are case and CPU fans to compensate, but entirely fanless systems will need some big heatsinks and an open chassis if you want reasonable performance.